<!DOCTYPE html>
<html>
  <head>
    <title>CSSOM View - Simultaneous scrollIntoViews</title>
    <link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/dom/events/scrolling/scroll_support.js"></script>
    <script src="/css/css-scroll-snap/support/common.js"></script>
    <script src="resources/simultaneousScrollIntoViews.js"></script>
  </head>
  <body>
    <style>
      .scroller {
        overflow-y: scroll;
        background-color: teal;
        border: solid 1px black;
        position: relative;
        resize: both;
        display: inline-block;
      }
      .scroller.outer {
        height: 400px;
        width: 400px;
      }
      .scroller.inner {
        height: 200px;
        width: 200px;
        position: absolute;
        top: 150%;
      }
      .space {
        height: 200vh;
        width: 200vw;
      }
      .box {
        height: 50px;
        width: 50px;
        background-color: purple;
      }
      .target {
        position: absolute;
        top: 150%;
      }
    </style>
    <div id="outerscroller1" class="outer scroller">
      <div class="space"></div>
      <div id="innerscroller1" class="inner scroller">
        <div class="space"></div>
        <div class="box target" id="target1"></div>
      </div>
    </div>
    <div id="outerscroller2" class="outer scroller">
      <div class="space"></div>
      <div id="innerscroller2" class="inner scroller">
        <div class="space"></div>
        <div class="box target" id="target2"></div>
      </div>
    </div>
    <script>
      const outerscroller1 = document.getElementById("outerscroller1");
      const outerscroller2 = document.getElementById("outerscroller2");
      const innerscroller1 = document.getElementById("innerscroller1");
      const innerscroller2 = document.getElementById("innerscroller2");
      const target1 = document.getElementById("target1");
      const target2 = document.getElementById("target2");

      const scrollers = [ outerscroller1,
                          outerscroller2,
                          innerscroller1,
                          innerscroller2 ];
      // Expect the outer scrollers to scroll to the inner scrollers
      // and the inner scrollers to scroll to their respective targets.
      const target_offsets = [ innerscroller1.offsetTop,
                               innerscroller2.offsetTop,
                               target1.offsetTop,
                               target2.offsetTop ];
      promise_test(async (t) => {
        await simultaneousScrollIntoViewsTest(t,
          ["smooth", "smooth"], [target1, target2], scrollers, target_offsets);
      }, "Simultaneous smooth scrollIntoViews run to completion");

      promise_test(async (t) => {
        await simultaneousScrollIntoViewsTest(t,
          ["smooth", "instant"], [target1, target2], scrollers, target_offsets);
      }, "Simultaneous smooth,instant scrollIntoViews run to completion");

      promise_test(async (t) => {
        await simultaneousScrollIntoViewsTest(t,
          ["instant", "smooth"], [target1, target2], scrollers, target_offsets);
      }, "Simultaneous instant,smooth scrollIntoViews run to completion");

      promise_test(async (t) => {
        await simultaneousScrollIntoViewsTest(t,
          ["instant", "instant"], [target1, target2], scrollers, target_offsets);
      }, "Simultaneous instant scrollIntoViews run to completion");
    </script>
  </body>
</html>
